chapman



(No Model.)

G. D. CHAPMAN.

' LATHE.

Patented Aug. 18, 1896.-

UNITED STATES PATENT OFFICE.

GEORGE D. CHAPMAN, OF FITCHBUBG, MASSACHUSETTS, ASSIGNOR TO JAMES L.CHAPMAN, HARRINGTON SIBLEY, AND JOSEPH S. WILSON,

OF SAME PLACE.

LATHE.

SPECIFICATION forming part of Letters Patent No. 566,060, dated August18, 1896.

Application filed February 25, 1895- Serial No. 539,692. (No model.)

: portions of a lathe as embody my invention. 7

My invention is adapted particularly to that class of lathes known asengine-turning lathes, which are provided with parallel rotating shaftsjournaled in brackets at the I side of the lathe-bed and employed toimpart a traversing motion to the tool-carriage along the ways of thelathe, one of said shafts be-' ing provided with a screw-thread andknown asthe feed-screw, while the other is designated the feed-rod.

The object of my invention is to provide means by which either thefeed-rod or feedscrew of the lathe can'be connected with a rotatingspindle, which is driven through a system of gearing known aschange-gears,

such as are commonly employed in driving the feed-screw of the lathe;and it consists in the construction and arrangement of parts ashereinafter described, and set forth in the o annexed claims.

Referring to the accompanying drawings, Figure 1 represents the head ofa lathe, showing a portion of the bed and one of the brackets attachedthereto, in which the feed-rod 3 5 and feed-screw are journaled. Fig. 2represents an end view of the bracket. Fig. 3 is a sectional view of thebracket on line 3 3, Fig. 2. Fig. 4 is a sectional view of the bracketon line 4 4, Fig. 3 5 and Fig. 5 repre- 0 sents a modified constructionand arrangement of the clutching device, the operating parts only beingshown.

Similar letters refer to similar parts in the different figures.

A denotes a portion of the lathe-bed, A the head in which thelive-spindle of the lathe ,is journaled, and 2 is a bracket attached tothe lathe-bed by screws A A The bracket A supports one end of a feed-rodB and a feed-screw 0, the opposite ends of the feedrod and feed-screwbeing usually supported by a bracket attached to the opposite end of thelathe-bed. (Not shown in the drawings.)

The end of the feed-rod B is .inclosed in a rotating sleeve 13*,journaled in thebracket A said feed-rod and sleeve being operativelyconnected in any suitable mannerin the present instance by means of acollar B attached to the end of the feed-rod and engaging the end of thesleeve B by means of clutch-teeth. Attached to the sleeve B is acone-pulley B, by which rotary motion is imparted to the sleeve B androd B by means of a belt connection with a driving-pulley in the usualand well -known manner. The sleeve B is provided with a pinion 13,either attached thereto or formed integrally with the sleeve, by whichrotary motion can be imparted to the sleeve B and rod B by means ofconnected operating mechanism, as hereinafter described.

The end of the feed-screw G is journaled in the bracket A and isprovided with an attached collar 0*, bearing against the side of thebracket, in order to receive the end thrust of the feed-screw.

J ournaled in the bracket A is a rotating spindle C, with its axis inalineinent with the axis of the feed-screw G and with their opposingends contiguous. Attached to the spindle G is a gear C forming one of atrain of gears known as change-gears, by which the spindle Ois connectedwith the live-spindle of the lathe. spindle C is a pinion C provided atits side with clutch-teeth C Attached to the end of the feed-screw O isTurning loosely upon the a collar 0 provided with clutch-teeth C on theside opposite the pinion C Sliding on the spindle O,but having a splineconnection therewith, is a sleeve D,

having at one end clutch-teeth D, adapted with an annular groove D toreceive the actuating-pin of the shipping mechanism,which consists of aspindle E, journaled in a plate E, attached to the bracket A and havinga milled knob E, by which the spindle E is rotated by the operator inorder to rotate the plate E attached to the spindle E. The plate E isprovided with an eccentric-pin E'flwhich engages the annular groove D ofthe sleeve D, the pin E being placed either directly above or below theaXis of the spindle E when the sleeve D is midway between the pinion Cand collar C and with its teeth disengaged from the teeth 0 and Cthereby allowing the spindle C to rotate without imparting its motion toeither the pinion C or collar 0 A slight rotation of the spindle E inone direction serves to slide the sleeve 1) along the spindle O andcarry the teeth D into engagement with the teethO, causing the pin ion 0to be rotated, while the rotation of the spindle E in the oppositedirection will carry the teeth D into engagement with the teeth Cimparting arotary motion to the shaft 0.

Held in the bracket A is a stud F, upon which is placed an intermediategear F, capable of rotating on the stud F and engaging the pinion O andthe pinion B so the rotation of the pinion O turning loosely on thespindle G, will impart a rotary motion to the feed-rod B through thepinion B and intermediate gear F. When the feed-rod is driven throughthe change-gear and spindle C, the belt connection between thecone-pulley B and its driving-pulley is removed by throwing off thebelt, as is usually done when the cutting-tool is actuated by thefeed-screw.

I am aware that it is not new to operatively connect the feed-screw andthe feedrod of a lathe so the rotary motion of one will be imparted tothe other, and I am also aware that it is not new to provide means bywhich the feed-rod and feed-screw can be connected or disconnected atwill, and I do not claim either of these features broadly. The purposeof my present invention is to provide an improved means foraccomplishing these results by which a single clutch only is required toconnect the driving power communicated through the change-gears witheither the feed-rod or feed-screw, and to simplify the construction andrender it less liable to wear, and also to inclose the operatingmechanism within the supporting bracket or framework.

In Fig. 5 I have represented a modified form of construction which,however, comes within the scope of a part of my invention, and othermodifications will readily occur to those conversant with theconstruction of this class of machinery.

In the modified construction illustrated by Fig. 5, B denotes thefeed-rod and C the feedscrew. To the feed-rod B, I attach the gear G,and to the screw 0, I attach the gear H. J ournaled between the feed-rodand feedscrew is a spindle I, to which rotary motion is imparted througheither the cone-pulley I or the gear 1 both of which are attached to thespindle I. Turning loosely upon the spindle I are the gears J and J,provided upon their opposing sides with clutch-teeth J and J Sliding onthe spindle I and between the gears J J" is a sleeve K, having a splineconnection with the spindle and provided with an annular groove K andwith clutch-teeth K and K adapted to engage the teeth J and J 011 thegears J J.

A shipping mechanism similar to that described above can be employed toslide the sleeve K and carry it midway the gears J J with its teethdisengaged from the teeth J J or to the right or left, bringing itsteeth into engagement with either the teeth J 2 J allowing the feed-rodB and feed-screw O to be entirely disconnected from the driving power,or either the feed-rod B or feed-screw O to be connected with thedriving power at will.

In the modified construction shown in Fig. 5 it will be observed thatthe driving-spindle O, which is shown in Fig. 3 as in alinement with thefeed-screw O, is transferred to aposition midway between the feed-rodand feed screw and becomes the driving-spindle I; and it will be obviousthat the driving-spindle can either be placed in alinement with thefeed-screw, as shown in Fig. 3, in which case the sliding sleeve is madeto engage clutchteeth on the collar 0 carried by the feedscrew, or itcan be placed out of alinement with the feed-screw, as shown in Fig. 5,requiring intermediate gears. It will also be obvious that the feed-rodB and feed-screw 0 could be made to change places by making B the screwand O the feed-rod.

The gist of my invention, so far as it relates to the clutchingmechanism itself is concerned, consists in employing a single rotatingsliding clutch operatively connected with the driving power ascommunicated through the change-gears and placed between connectedoperative mechanism leading on one side to the feed-screw and 011 theother side to the feed-rod, whereby the sliding motion of the clutch inone direction serves to connect the driving power with the feed-rod, andits sliding motion in the opposite direction serves to connect it withthe feed-screw, thereby enabling me to secure the extreme variation inthe movement of the cutting-tool when actuated through the feed-rod aswhen actuated through the feed screw. lhe bracket A is provided with achamber A, closed by the plate E in order to inclose the clutchingmechanism, the milled knob E being the only portion exposed to view, andat the edge of the bracket A is a curved flange A forming a chamber A toinclose the pinion B and the gear F, so the front view of the latheshows none of the connecting mechanism journaled on the bed of thelathe,means for imparting rotary motion to said driving-spindle, apinion running loosely on said drivingspindle, a sliding clutchingmechanism having a spline connection with said driving-spindle andadapted to connect said driving-spindle with said feed-screw when movedin one direction, and to connect said driving-spindle with the pinionrunning loosely thereon when 'moved in the opposite direction, andmeans.

for connecting said loose pinion with said feed-rod, substantially asdescribed.

Dated this 11th day of February, 1895.

GEO. D. CHAPMAN. Witnesses:

F. O. CURRIER, J. M. SARGENT.

